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TODD'S BEATS

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A compact phono preamplifier from Pro-Ject with two replaceable ECC83 tubes, a fully discrete circuit with no operational amplifiers, and support for MM and MC cartridges.

Pro-Ject says the Tube Box S2 is its first product with a fully discrete circuit design, and its first with replaceable tubes for tube rolling. Pro-Ject describes the sound as full and relaxed, with lush mids.

Tubes

2 x ECC83 (12AX7A), replaceable

Cartridges

MM and MC

Gain

40, 43, 50, 60 and 63 dB

Filter

Subsonic, 20 Hz, 18 dB/octave

Connections

RCA in and RCA out

Finish

Black or silver

Why you will love it

Replaceable tubes

The Tube Box S2 uses two ECC83 (12AX7A) tubes. Pro-Ject says they can be swapped, so you can try different tubes to shape the sound to your taste.

Pro-Ject says the output stage gives a full and relaxed sound with lush mids. Treat that as Pro-Ject's description of the intended character.

Discrete circuit, no OpAmps

Pro-Ject says the Tube Box S2 is its first product with a fully discrete design that uses no operational amplifiers. The circuit has a FET input stage and dual mono circuitry for channel separation, with polystyrene capacitors used where possible.

Pro-Ject also lists precise RIAA equalisation in two parts, passive and active, and gold-plated RCA inputs and outputs.

Gain and loading on the front and rear

The front panel has a gain control and a subsonic filter button. Pro-Ject lists gain settings of 40, 43, 50, 60 and 63 dB, and a subsonic filter at 20 Hz with 18 dB per octave.

Pro-Ject lists input impedance settings of 10 ohms, 100 ohms, 1 kohm and 2 kohms, plus a fixed 47 kohm setting that suits high-output MC cartridges, with several input capacitance options. Check your cartridge maker's recommended load before choosing.

Rear panel of the Pro-Ject Tube Box S2 with RCA input and output sockets

Casing and power

The sandwich aluminium and metal casing is designed to protect against vibration and electromagnetic interference, according to Pro-Ject. It uses an external power adaptor with multiple internal power supplies and a filtered high-voltage anode supply.

Pro-Ject lists the Accu Box S2 as a compatible upgrade power supply.

Is it right for you?

A great fit if you…

Want a phono preamp with replaceable tubes
Like to adjust gain and loading to suit the cartridge
Use an MM or MC cartridge
Have limited space and want a small unit

Worth knowing

Tube sound varies with the tubes fitted, so results depend on your choice of tubes
It has a single pair of RCA phono inputs and a single pair of RCA line outputs
It runs from an external 18 V DC power supply
Choose black or silver when you order

Build your system

Connect the Tube Box S2 between your turntable and the line input of your amplifier.

Turntable: Pair it with a turntable such as the Pro-Ject X2 B or Debut EVO 2, or browse our turntable range
Amplifier: Connect to an integrated amplifier from our stereo amplifier range
Speakers: Add a pair of bookshelf speakers or floor-standing speakers
Simpler option: For a compact MM/MC preamp without tubes, see the Pro-Ject Phono Box

Specifications

Electrical

Tubes	2 x ECC83 (12AX7A)
Input gain	40, 43, 50, 60 and 63 dB
Input impedance	10 ohms, 100 ohms, 1 kohm, 2 kohms and 47 kohms
Noise floor	80 dB (A-weighted) at 40 dB gain; 75 dB (A-weighted) at 50 dB and 63 dB gain
THD	Below 0.02% at 40 dB gain; below 0.05% at 50 dB and 63 dB gain
RIAA curve accuracy	+/- 0.4 dB, 20 Hz - 20 kHz
Subsonic filter	20 Hz, 18 dB/octave

Connections and size

Input	1 pair RCA
Line output	1 pair RCA
Power supply	Outboard, 18 V / 1,000 mA DC
Power consumption	470 mA DC; below 1 W on standby
Dimensions (W x H x D)	103 x 73 x 131 mm (with sockets)
Weight	410 g (without power supply)

Specifications from Pro-Ject Audio Systems (Tube Box S2 product page), checked November 2026.

Questions people ask

Can I change the tubes?

Yes. Pro-Ject says the Tube Box S2 has replaceable tubes for tube rolling. It ships with two ECC83 (12AX7A) tubes.

Does it work with MC cartridges?

Pro-Ject says it supports both MM and MC cartridges. The 47 kohm setting is described as suited to high-output MC cartridges.

Is there a subsonic filter?

Yes. A front-panel button switches the subsonic filter, which Pro-Ject lists at 20 Hz and 18 dB per octave.

Is there an upgrade power supply?

Pro-Ject lists the Accu Box S2 as a compatible upgrade power supply.

5.0

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BC
Brenden C.
Verified Buyer
I recommend this product
Rated 5 out of 5 stars
1 year ago
Tub box s2
Great product. Looks and sounds sooo good. Delivered right on time, everything was easy.
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